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Date:      Fri, 10 Sep 1999 02:16:32 +0800
From:      Peter Wemm <peter@netplex.com.au>
To:        Mike Smith <mike@smith.net.au>
Cc:        Luigi Rizzo <luigi@labinfo.iet.unipi.it>, hackers@freebsd.org
Subject:   Re: damn ATX power supplies... 
Message-ID:  <19990909181632.2CAAA1CAE@overcee.netplex.com.au>
In-Reply-To: Your message of "Thu, 09 Sep 1999 10:35:52 MST." <199909091735.KAA00703@dingo.cdrom.com> 

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Mike Smith wrote:
> 
> > any idea on how to force ATX power supplies to restart after a power
> > outage without having someone press the 'power' button on the front
> > panel ? All the motherboards i can find now have their bios with two
> > options:
> > 
> > 	Disabled
> > 		no automatic restart on power failure
> 
> You _should_ be able to change this.
> 
> > none of them is satisfactory especially for picoBSD things such as
> > routers or firewalls where an UPS is overkill...
> 
> You can always hotwire the supply; go dig up a pinout for the ATX power 
> connector and you'll see that if you ground the power-on line the PSU 
> will come up...

The magic wire is on pin 14, usually the only green wire.  Cut the lead and
connect the power supply side of it to ground and the ATX power supply will
stay on permanently.  I'm using this on two systems that will not restart
after AC power loss.

Cheers,
-Peter
--
Peter Wemm - peter@FreeBSD.org; peter@yahoo-inc.com; peter@netplex.com.au



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